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(FILES) Picture taken on October 11, 1994 shows Dr John Nash, a Visiting Research Collaborator at Princetone University, New Jersey. Nash, 86, and Louis Nirenberg, 90, were awarded Norway's prestigious Abel Prize on March 25, 2015 for "striking and seminal contributions to the theory of nonlinear partial differential equations (PDEs) and its applications to geometric analysis," the Norwegian Academy of Sciences and Letters said in a statement. AFP PHOTO / BOB STRONGBOB STRONG/AFP/Getty Images